Schrempp Makers

Shopbot and Tormak • Problems when cutting

2015-02-24T00:48:04

If your wood part smokes, then either increase the feed rate or slow the spindle RPM.

If you hear screeching, they you are feeding to fast - or too slow. Try slowing the feedrate first. If that doesn't work, then increase the feed rate a bit.

Statistics: Posted by jschrempp — Tue Feb 24, 2015 12:48 am

Shopbot and Tormak • Re: Bits

2015-02-24T00:46:18

Dan-Mar Tools is a good source of bits
907 American Street, San Carlos, CA 94070
Phone:(650) 591-2651

Statistics: Posted by jschrempp — Tue Feb 24, 2015 12:46 am

Shopbot and Tormak • Bits

2015-02-24T00:44:15

The more flutes a bit has, the more heat it generates.

Typical flutes for materials:

Plastic: 2
Wood: 1 or 2
Aluminum: 2
Steel: 4

Statistics: Posted by jschrempp — Tue Feb 24, 2015 12:44 am

Shopbot and Tormak • Speeds and Feeds

2015-02-24T00:42:53

WIkipedia has a good page on speeds and feeds. In particular, you can get the cutting speeds for many materials using a high speed steel cutter.

http://en.wikipedia.org/wiki/Speeds_and_feeds

Missing from the Wikipedia table is Wood. The Cutting Speed for a soft wood, such as pine, is 1000 feet per minute.

There is a recommended speeds and feeds calculator at

http://www.custompartnet.com/calculator ... d-and-feed

The calculator needs Feed per Tooth. We were told to use the following values:

Aluminum: 1/100th the bit diameter
Wood: 1/50th the bit diameter
Foam: 0.1

Plunge speed should be about 1/3 the feed rate.

Statistics: Posted by jschrempp — Tue Feb 24, 2015 12:42 am